Liebstoeckl is also known as lovage. If unavailable, fresh parsley or chervil can be used as a substitute, though the flavor profile will be milder.
Liquamen is a fermented fish sauce used in ancient Roman cooking. Fish sauce or Worcestershire sauce are acceptable modern substitutes if Liquamen is not available.
For best texture, ensure shrimps are completely cooled before adding the dressing to prevent the egg yolks from cooking further.
This dish can be stored in the refrigerator for up to 2 days. Cover tightly to prevent drying out.